As we know that 3DS new firmware V3.0.0-5 update has arrived, some cards have been confirmed still working, such as DStwo, r4i gold (r4ids.cn), Some cards have been blocked, including Acekard 2i, R4i sdhc.... Details below:
Working cards
Supercard DSTWO
iEvolution(DSi Mode)
R4i Gold 3DS...